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Guarantees (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Product Warranty [Abstract]    
Period of warranty 12 months  
Change in warranty accrual [Roll Forward]    
Beginning accrued warranty and related costs $ 1,003,000 $ 740,000
Accruals for warranties issued during the year 362,000 749,000
Adjustments related to pre-existing warranties including expirations and changes in estimates (450,000) 196,000
Cost of warranty repair (327,000) (682,000)
Ending accrued warranty and related costs $ 588,000 $ 1,003,000